Abstract

A Foucault pendulum equipped with a low-cost computer interface is described. It allows one to measure the precession rate of the plane of oscillation due to Earth rotation within a few minutes. A graphic interface (PC tablet) serves as a frictionless two-dimensional position sensor. By using standard software tools it is possible to record the position of the pendulum up to 50 samples/s. Although the sensor provides only rather coarse-grained data, the method is remarkably precise due to statistical analysis of the data.

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